Practicality? ...scoff

Should you ever give up your dreams for any reason? What if it's so impractical, you can't imagine how to succeed? Should you abandon them then due to practicality? Maybe. I hope not. I once had a professor who said if your plan seems obtainable, then you're not dreaming big enough. I always try to keep that in mind when people tell me my dreams are impractical. Screw practicality.